From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eduardo Valentin Subject: [PATCHv4 01/18] thermal: allow registering without .get_temp Date: Thu, 26 Sep 2013 23:13:08 -0400 Message-ID: <1380251605-3804-2-git-send-email-eduardo.valentin@ti.com> References: <1380251605-3804-1-git-send-email-eduardo.valentin@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from comal.ext.ti.com ([198.47.26.152]:42000 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750722Ab3I0DOm (ORCPT ); Thu, 26 Sep 2013 23:14:42 -0400 In-Reply-To: <1380251605-3804-1-git-send-email-eduardo.valentin@ti.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: swarren@wwwdotorg.org, pawel.moll@arm.com, mark.rutland@arm.com, ian.campbell@citrix.com, rob.herring@calxeda.com, linux@roeck-us.net, rui.zhang@intel.com, wni@nvidia.com Cc: grant.likely@linaro.org, durgadoss.r@intel.com, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, lm-sensors@lm-sensors.org, linux-kernel@vger.kernel.org, Eduardo Valentin This patch changes the thermal core driver to allow registration of thermal zones without the .get_temp callback. The idea behind this change is to allow lazy registration of sensor callbacks. The thermal zone will be disabled whenever the ops does not contain a .get_temp callback. The sysfs interface will be returning -EINVAL on any temperature read operation. Cc: Zhang Rui Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Eduardo Valentin --- drivers/thermal/thermal_core.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 4962a6a..8a94300 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -402,7 +402,7 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp) enum thermal_trip_type type; #endif - if (!tz || IS_ERR(tz)) + if (!tz || IS_ERR(tz) || !tz->ops->get_temp) goto exit; mutex_lock(&tz->lock); @@ -455,6 +455,9 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) { int count; + if (!tz->ops->get_temp) + return; + update_temperature(tz); for (count = 0; count < tz->trips; count++) @@ -1384,7 +1387,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) return ERR_PTR(-EINVAL); - if (!ops || !ops->get_temp) + if (!ops) return ERR_PTR(-EINVAL); if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp)) @@ -1488,6 +1491,9 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check); + if (!tz->ops->get_temp) + thermal_zone_device_set_polling(tz, 0); + thermal_zone_device_update(tz); if (!result) -- 1.8.2.1.342.gfa7285d